Titan's temperature profile allows for the condensation of
many of its trace gases throughout the troposphere and lower
stratosphere. It is likely that cloud particles will be
composed of a mixture of multiple volatile components
surrounding a tholin core. We have developed a microphysics
model to study the evolution of clouds composed of multiple
condensible species in Titan's atmosphere.

We will report results on cloud properties (including
particle size, composition, vertical extent and optical
depth) for clouds composed of both methane and ethane. New
laboratory measurements of methane nucleation onto an ethane
substrate are incorporated into the model. We consider cases
of both pure methane and methane containing dissolved
nitrogen.